Ignore clicks on shortcuts' drag handles.

When touching down within the drag handle's bounds, we remove the
onClickListener temporarily (restored when touching down outside
of the drag handle's bounds). Long clicks still start the drag.

Also increased drag threshold from 12dp to 16dp.

Bug: 30816665

Change-Id: I0b33dc34bf95c0532376f2f7cf50865fa50093de
2 files changed